Lock



Feb. l0, 1925. 1,526,047

S. D. BUTTERWORTH LOCK Filed Oct. 6, 192,2l

@timmy Patented Feb. 10, 1925.

UNITED STATES SAMUEL D. BUTTERWORTH, 0F LANSING, MICHIGAN.

Loox.

Application filed October 6, 1922. Serial No. 592,690.

To @ZZ 'whom t may concern.'

Be it known that I, SAMUEL D. BUTTER- wonTH, a citizen of the United States, residing at Lansing, in the county of Ingham and State of Michigan, have invented certain new and useful Improvements in Locks, of which the following is a specification.

This invention relates to locks, more particularly to one which is provided with means whereby the latch bolts can be locked from either side of the door.

The object is to provide a tell-tale means for indicating that the room is locked from the inside while occupied. Aj further object is to provide a camouflaged key passageway so access may be had to the locking means when locked from the inside of the door in an emergency.

In the drawings:

Fig. l is a vertical section through the door showing the lock in elevation with the cover plate removed.

Fig. 2 is a section on the line 2-2 of Fig. l.

Fig. 3 is a detail perspective of the dog operated from the inside of the door.

Fig. iis a detail perspective of the dog operated from the outside of the door.

Fig. 5 is a view of the emergency key.

The door a has mounted therein the lock casing ZJ provided with the usual face plate c which is secured to the door by a screw or other means. A striker plate Z is secured into the door frame.

For illustration I have used the latch bolt and clogging arrangement as described and claimed in my copending application No. 537,372. As this feature forms no part of the present invention it need not be described in detail. To enable one to clearly understand the object of the invention it is sulficient to designate the sliding latch bolt e, which is dogged from the outside of the door by actuating the dog f, and similarly the dog g is actuated from the inside of the door.

One of the main features of this invention is to provide a tell-tale ZL which is pushed out into the position as indicated by the dotted lines in Fig. 2. The dog g is rotated by turning the thumb handle z' provided with the usual squared end portion engaging with the dog. rIlhe dog g has the lug y' extending l from the side thereof provided with a beveled face le. The tell-tale ZL is pressed inwardly by the spring Z and when the dog is in the position as shown in the drawing, i. e., unlatched from the inside of the door, one end of the tell-tale is flush with the face of the door (see Fig. 2) and the other end projects into the lock casing. When the dog g is actuated to dog the latch bolt, as shown in the dotted lines in Fig. l, the lugs 7' engage with the inner end of the telltale pushing it out into the dotted position (Fig. 2) thus indicating that theroom is occupied.

The dog g is provided with the reduced end portions m engaged in an opening in the lock casing; and is provided with a transverse slot n for a purpose hereinafter described.

A11 escutcheon plate 0 is secured on the outside of the door and carries a cylinder lock or other means for actuating the dog f. Engaging through this escutcheon plate is a screw p which outwardly appears to be one of the screws for holding the plate in place. A plate g is set into the door in which the screw p is threaded. Directly behind this screw is a key-passageway a" which registers with the reduced end portion of the dog g.

It is necessary sometimes to enter a room which has been locked from the inside and heretofore this could not be done without destroying the lock. To accomplish this with the present construction it is only necessary to remove the screw p and insert the emergency key s which is provided with the wings t adapted to engage with the transverse slots n. in the dog g. The dog can then be actuated from the outside of the door releasing the latch bolt and access may be had to the room without destroying the lock.

The function of the camouflaging screw is not only to conceal the key passageway, but to prevent rotation of the escutcheon plate. In the specification and claims I have referred to the screw as a camouflaged screw since the said screw not only conceals the key passageway but it conceals the fact that the key passageway is concealed; I know of no better word or term to apply to this screw in view of the function which it performs.

What I claim is 1. In a lock, the combination of a latch bolt, a turn-button for locking the door from the inside, and a key passageway from the outside to connect with the turn-button, and means for camouaging said key passageway.

fill

Q. In a look,V the combination of aLA lateh Y ing said key passageway whereby the saidl looking means: may be actuated through said passageway from the-outside oythe ldoor :after removing said eamoulaging screw.

3'. I-n as-loek-,Jyhe combination fof alateh bolty'a dogfor looking the latch iholtgormally actuated from the inside of the, door. pi'ovidednwithfa slotJ in the andthe-reni, a key passageway eolmeeting with the dogyand means for eamouiag':,ring .the` passageway', whereby adiey may engage theslot insaid dog thoughfthe keypassageway afteiithe means for Vcamou'aging said y'passageway has lheen'removed; l Y

4f. In a fleek, the combination of a latch opening and for holding said eseuteheon plateA .against Detation. i

In a lock, the combination of a latch holt, means for loekingthe door from, the inside, an escutoheon platehavingaan opening YthereinV-inou'ntedf on ytha-outside of the door,@key-passageway eonnectingthe openingwit-htheloekingmeans. and a, camouflage screw engaging in the-opening in saideseutcheonjplate and holding the same against reteflll-v e 1 v W lin testimony whereof I affix my signa- 

